My suggestion is a
Overhead suited to trolling/deep bottom bashing with 50lb braid
Overhead or spin with straight through mono for shallower <20m bottom bashing as this saves rerigging time.
Lighter spin stick for flicking around the reef or off the big boat at night and early morn. I use around 15lb braid.
Hooks from 5/0 to 9/0, some 7/0 gangs
Sinkers from 00-16oz
Some trolling lures (halco lazer pros, rapalas are good), wire, leader (20-80lb).
Gloves for the hands as the little nick from a fish spike on day one becomes an infected mess by day 5.
Fish pliers, sun protection, baloons, small bag/bum bag to put spare tackle in whilst he is in the dory or even at the rail of the big boat.